Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1911 insertions, 0 deletions

diff --git a/tests/ui/rfc-2497-if-let-chains/disallowed-positions.stderr b/tests/ui/rfc-2497-if-let-chains/disallowed-positions.stderr
new file mode 100644
index 000000000..3028f8dbd
--- /dev/null
+++ b/tests/ui/rfc-2497-if-let-chains/disallowed-positions.stderr
@@ -0,0 +1,1911 @@
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:29:9
+   |
+LL |     if (let 0 = 1) {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:33:11
+   |
+LL |     if (((let 0 = 1))) {}
+   |           ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:37:9
+   |
+LL |     if (let 0 = 1) && true {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:41:17
+   |
+LL |     if true && (let 0 = 1) {}
+   |                 ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:45:9
+   |
+LL |     if (let 0 = 1) && (let 0 = 1) {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:45:24
+   |
+LL |     if (let 0 = 1) && (let 0 = 1) {}
+   |                        ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:51:35
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                   ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:51:48
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                                ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:51:61
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                                             ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:61:12
+   |
+LL |     while (let 0 = 1) {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:65:14
+   |
+LL |     while (((let 0 = 1))) {}
+   |              ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:69:12
+   |
+LL |     while (let 0 = 1) && true {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:73:20
+   |
+LL |     while true && (let 0 = 1) {}
+   |                    ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:77:12
+   |
+LL |     while (let 0 = 1) && (let 0 = 1) {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:77:27
+   |
+LL |     while (let 0 = 1) && (let 0 = 1) {}
+   |                           ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:83:38
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:83:51
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                                   ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:83:64
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                                                ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:110:9
+   |
+LL |     if &let 0 = 0 {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:115:9
+   |
+LL |     if !let 0 = 0 {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:118:9
+   |
+LL |     if *let 0 = 0 {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:122:9
+   |
+LL |     if -let 0 = 0 {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:132:9
+   |
+LL |     if (let 0 = 0)? {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:138:16
+   |
+LL |     if true || let 0 = 0 {}
+   |                ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:141:17
+   |
+LL |     if (true || let 0 = 0) {}
+   |                 ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:144:25
+   |
+LL |     if true && (true || let 0 = 0) {}
+   |                         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:147:25
+   |
+LL |     if true || (true && let 0 = 0) {}
+   |                         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:152:12
+   |
+LL |     if x = let 0 = 0 {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:157:15
+   |
+LL |     if true..(let 0 = 0) {}
+   |               ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:161:11
+   |
+LL |     if ..(let 0 = 0) {}
+   |           ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:165:9
+   |
+LL |     if (let 0 = 0).. {}
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:196:19
+   |
+LL |     if let true = let true = true {}
+   |                   ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:202:12
+   |
+LL |     while &let 0 = 0 {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:207:12
+   |
+LL |     while !let 0 = 0 {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:210:12
+   |
+LL |     while *let 0 = 0 {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:214:12
+   |
+LL |     while -let 0 = 0 {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:224:12
+   |
+LL |     while (let 0 = 0)? {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:230:19
+   |
+LL |     while true || let 0 = 0 {}
+   |                   ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:233:20
+   |
+LL |     while (true || let 0 = 0) {}
+   |                    ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:236:28
+   |
+LL |     while true && (true || let 0 = 0) {}
+   |                            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:239:28
+   |
+LL |     while true || (true && let 0 = 0) {}
+   |                            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:244:15
+   |
+LL |     while x = let 0 = 0 {}
+   |               ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:249:18
+   |
+LL |     while true..(let 0 = 0) {}
+   |                  ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:253:14
+   |
+LL |     while ..(let 0 = 0) {}
+   |              ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:257:12
+   |
+LL |     while (let 0 = 0).. {}
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:288:22
+   |
+LL |     while let true = let true = true {}
+   |                      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:304:6
+   |
+LL |     &let 0 = 0;
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:308:6
+   |
+LL |     !let 0 = 0;
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:311:6
+   |
+LL |     *let 0 = 0;
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:315:6
+   |
+LL |     -let 0 = 0;
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:325:6
+   |
+LL |     (let 0 = 0)?;
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:331:13
+   |
+LL |     true || let 0 = 0;
+   |             ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:334:14
+   |
+LL |     (true || let 0 = 0);
+   |              ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:337:22
+   |
+LL |     true && (true || let 0 = 0);
+   |                      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:342:9
+   |
+LL |     x = let 0 = 0;
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:346:12
+   |
+LL |     true..(let 0 = 0);
+   |            ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:349:8
+   |
+LL |     ..(let 0 = 0);
+   |        ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:352:6
+   |
+LL |     (let 0 = 0)..;
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:356:6
+   |
+LL |     (let Range { start: _, end: _ } = true..true || false);
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:361:6
+   |
+LL |     (let true = let true = true);
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:361:17
+   |
+LL |     (let true = let true = true);
+   |                 ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:368:25
+   |
+LL |         let x = true && let y = 1;
+   |                         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:374:19
+   |
+LL |         [1, 2, 3][let _ = ()]
+   |                   ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:379:6
+   |
+LL |     &let 0 = 0
+   |      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:391:17
+   |
+LL |         true && let 1 = 1
+   |                 ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:397:17
+   |
+LL |         true && let 1 = 1
+   |                 ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:403:17
+   |
+LL |         true && let 1 = 1
+   |                 ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:415:17
+   |
+LL |         true && let 1 = 1
+   |                 ^^^
+
+error: expressions must be enclosed in braces to be used as const generic arguments
+  --> $DIR/disallowed-positions.rs:415:9
+   |
+LL |         true && let 1 = 1
+   |         ^^^^^^^^^^^^^^^^^
+   |
+help: enclose the `const` expression in braces
+   |
+LL |         { true && let 1 = 1 }
+   |         +                   +
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:425:9
+   |
+LL |     if (let Some(a) = opt && true) {
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:430:9
+   |
+LL |     if (let Some(a) = opt) && true {
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:434:9
+   |
+LL |     if (let Some(a) = opt) && (let Some(b) = a) {
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:434:32
+   |
+LL |     if (let Some(a) = opt) && (let Some(b) = a) {
+   |                                ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:443:9
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:443:31
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
+   |                               ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:449:9
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:449:31
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
+   |                               ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:455:9
+   |
+LL |     if (let Some(a) = opt && (true)) && true {
+   |         ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:472:22
+   |
+LL |     let x = (true && let y = 1);
+   |                      ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:477:20
+   |
+LL |         ([1, 2, 3][let _ = ()])
+   |                    ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:99:16
+   |
+LL |     use_expr!((let 0 = 1 && 0 == 0));
+   |                ^^^
+
+error: expected expression, found `let` statement
+  --> $DIR/disallowed-positions.rs:103:16
+   |
+LL |     use_expr!((let 0 = 1));
+   |                ^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:29:9
+   |
+LL |     if (let 0 = 1) {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:29:9
+   |
+LL |     if (let 0 = 1) {}
+   |         ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:33:11
+   |
+LL |     if (((let 0 = 1))) {}
+   |           ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:33:11
+   |
+LL |     if (((let 0 = 1))) {}
+   |           ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:37:9
+   |
+LL |     if (let 0 = 1) && true {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:37:9
+   |
+LL |     if (let 0 = 1) && true {}
+   |         ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:41:17
+   |
+LL |     if true && (let 0 = 1) {}
+   |                 ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:41:17
+   |
+LL |     if true && (let 0 = 1) {}
+   |                 ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:45:9
+   |
+LL |     if (let 0 = 1) && (let 0 = 1) {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:45:9
+   |
+LL |     if (let 0 = 1) && (let 0 = 1) {}
+   |         ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:45:24
+   |
+LL |     if (let 0 = 1) && (let 0 = 1) {}
+   |                        ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:45:24
+   |
+LL |     if (let 0 = 1) && (let 0 = 1) {}
+   |                        ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:51:35
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                   ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:51:35
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:51:48
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                                ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:51:35
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:51:61
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                                             ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:51:35
+   |
+LL |     if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:61:12
+   |
+LL |     while (let 0 = 1) {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:61:12
+   |
+LL |     while (let 0 = 1) {}
+   |            ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:65:14
+   |
+LL |     while (((let 0 = 1))) {}
+   |              ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:65:14
+   |
+LL |     while (((let 0 = 1))) {}
+   |              ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:69:12
+   |
+LL |     while (let 0 = 1) && true {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:69:12
+   |
+LL |     while (let 0 = 1) && true {}
+   |            ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:73:20
+   |
+LL |     while true && (let 0 = 1) {}
+   |                    ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:73:20
+   |
+LL |     while true && (let 0 = 1) {}
+   |                    ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:77:12
+   |
+LL |     while (let 0 = 1) && (let 0 = 1) {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:77:12
+   |
+LL |     while (let 0 = 1) && (let 0 = 1) {}
+   |            ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:77:27
+   |
+LL |     while (let 0 = 1) && (let 0 = 1) {}
+   |                           ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:77:27
+   |
+LL |     while (let 0 = 1) && (let 0 = 1) {}
+   |                           ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:83:38
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:83:38
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:83:51
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                                   ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:83:38
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:83:64
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                                                ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:83:38
+   |
+LL |     while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
+   |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:99:16
+   |
+LL |     use_expr!((let 0 = 1 && 0 == 0));
+   |                ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:99:16
+   |
+LL |     use_expr!((let 0 = 1 && 0 == 0));
+   |                ^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:99:16
+   |
+LL |     use_expr!((let 0 = 1 && 0 == 0));
+   |                ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:99:16
+   |
+LL |     use_expr!((let 0 = 1 && 0 == 0));
+   |                ^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:103:16
+   |
+LL |     use_expr!((let 0 = 1));
+   |                ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:103:16
+   |
+LL |     use_expr!((let 0 = 1));
+   |                ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:103:16
+   |
+LL |     use_expr!((let 0 = 1));
+   |                ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:103:16
+   |
+LL |     use_expr!((let 0 = 1));
+   |                ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:110:9
+   |
+LL |     if &let 0 = 0 {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:115:9
+   |
+LL |     if !let 0 = 0 {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:118:9
+   |
+LL |     if *let 0 = 0 {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:122:9
+   |
+LL |     if -let 0 = 0 {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:132:9
+   |
+LL |     if (let 0 = 0)? {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:132:9
+   |
+LL |     if (let 0 = 0)? {}
+   |         ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:138:16
+   |
+LL |     if true || let 0 = 0 {}
+   |                ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:138:13
+   |
+LL |     if true || let 0 = 0 {}
+   |             ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:141:17
+   |
+LL |     if (true || let 0 = 0) {}
+   |                 ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:141:14
+   |
+LL |     if (true || let 0 = 0) {}
+   |              ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:144:25
+   |
+LL |     if true && (true || let 0 = 0) {}
+   |                         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:144:22
+   |
+LL |     if true && (true || let 0 = 0) {}
+   |                      ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:147:25
+   |
+LL |     if true || (true && let 0 = 0) {}
+   |                         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:147:17
+   |
+LL |     if true || (true && let 0 = 0) {}
+   |                 ^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:152:12
+   |
+LL |     if x = let 0 = 0 {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:157:15
+   |
+LL |     if true..(let 0 = 0) {}
+   |               ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:157:15
+   |
+LL |     if true..(let 0 = 0) {}
+   |               ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:161:11
+   |
+LL |     if ..(let 0 = 0) {}
+   |           ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:161:11
+   |
+LL |     if ..(let 0 = 0) {}
+   |           ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:165:9
+   |
+LL |     if (let 0 = 0).. {}
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:165:9
+   |
+LL |     if (let 0 = 0).. {}
+   |         ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:171:8
+   |
+LL |     if let Range { start: _, end: _ } = true..true && false {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:175:8
+   |
+LL |     if let Range { start: _, end: _ } = true..true || false {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:182:8
+   |
+LL |     if let Range { start: F, end } = F..|| true {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:190:8
+   |
+LL |     if let Range { start: true, end } = t..&&false {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:196:19
+   |
+LL |     if let true = let true = true {}
+   |                   ^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:202:12
+   |
+LL |     while &let 0 = 0 {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:207:12
+   |
+LL |     while !let 0 = 0 {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:210:12
+   |
+LL |     while *let 0 = 0 {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:214:12
+   |
+LL |     while -let 0 = 0 {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:224:12
+   |
+LL |     while (let 0 = 0)? {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:224:12
+   |
+LL |     while (let 0 = 0)? {}
+   |            ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:230:19
+   |
+LL |     while true || let 0 = 0 {}
+   |                   ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:230:16
+   |
+LL |     while true || let 0 = 0 {}
+   |                ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:233:20
+   |
+LL |     while (true || let 0 = 0) {}
+   |                    ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:233:17
+   |
+LL |     while (true || let 0 = 0) {}
+   |                 ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:236:28
+   |
+LL |     while true && (true || let 0 = 0) {}
+   |                            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:236:25
+   |
+LL |     while true && (true || let 0 = 0) {}
+   |                         ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:239:28
+   |
+LL |     while true || (true && let 0 = 0) {}
+   |                            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:239:20
+   |
+LL |     while true || (true && let 0 = 0) {}
+   |                    ^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:244:15
+   |
+LL |     while x = let 0 = 0 {}
+   |               ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:249:18
+   |
+LL |     while true..(let 0 = 0) {}
+   |                  ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:249:18
+   |
+LL |     while true..(let 0 = 0) {}
+   |                  ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:253:14
+   |
+LL |     while ..(let 0 = 0) {}
+   |              ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:253:14
+   |
+LL |     while ..(let 0 = 0) {}
+   |              ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:257:12
+   |
+LL |     while (let 0 = 0).. {}
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:257:12
+   |
+LL |     while (let 0 = 0).. {}
+   |            ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:263:11
+   |
+LL |     while let Range { start: _, end: _ } = true..true && false {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:267:11
+   |
+LL |     while let Range { start: _, end: _ } = true..true || false {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:274:11
+   |
+LL |     while let Range { start: F, end } = F..|| true {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:282:11
+   |
+LL |     while let Range { start: true, end } = t..&&false {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:288:22
+   |
+LL |     while let true = let true = true {}
+   |                      ^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:304:6
+   |
+LL |     &let 0 = 0;
+   |      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:308:6
+   |
+LL |     !let 0 = 0;
+   |      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:311:6
+   |
+LL |     *let 0 = 0;
+   |      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:315:6
+   |
+LL |     -let 0 = 0;
+   |      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:325:6
+   |
+LL |     (let 0 = 0)?;
+   |      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:325:6
+   |
+LL |     (let 0 = 0)?;
+   |      ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:331:13
+   |
+LL |     true || let 0 = 0;
+   |             ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:331:10
+   |
+LL |     true || let 0 = 0;
+   |          ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:334:14
+   |
+LL |     (true || let 0 = 0);
+   |              ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:334:11
+   |
+LL |     (true || let 0 = 0);
+   |           ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:337:22
+   |
+LL |     true && (true || let 0 = 0);
+   |                      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `||` operators are not supported in let chain expressions
+  --> $DIR/disallowed-positions.rs:337:19
+   |
+LL |     true && (true || let 0 = 0);
+   |                   ^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:342:9
+   |
+LL |     x = let 0 = 0;
+   |         ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:346:12
+   |
+LL |     true..(let 0 = 0);
+   |            ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:346:12
+   |
+LL |     true..(let 0 = 0);
+   |            ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:349:8
+   |
+LL |     ..(let 0 = 0);
+   |        ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:349:8
+   |
+LL |     ..(let 0 = 0);
+   |        ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:352:6
+   |
+LL |     (let 0 = 0)..;
+   |      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:352:6
+   |
+LL |     (let 0 = 0)..;
+   |      ^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:356:6
+   |
+LL |     (let Range { start: _, end: _ } = true..true || false);
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:361:6
+   |
+LL |     (let true = let true = true);
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:361:6
+   |
+LL |     (let true = let true = true);
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:379:6
+   |
+LL |     &let 0 = 0
+   |      ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:391:17
+   |
+LL |         true && let 1 = 1
+   |                 ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:397:17
+   |
+LL |         true && let 1 = 1
+   |                 ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:403:17
+   |
+LL |         true && let 1 = 1
+   |                 ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:415:17
+   |
+LL |         true && let 1 = 1
+   |                 ^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:425:9
+   |
+LL |     if (let Some(a) = opt && true) {
+   |         ^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:425:9
+   |
+LL |     if (let Some(a) = opt && true) {
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:430:9
+   |
+LL |     if (let Some(a) = opt) && true {
+   |         ^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:430:9
+   |
+LL |     if (let Some(a) = opt) && true {
+   |         ^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:434:9
+   |
+LL |     if (let Some(a) = opt) && (let Some(b) = a) {
+   |         ^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:434:9
+   |
+LL |     if (let Some(a) = opt) && (let Some(b) = a) {
+   |         ^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:434:32
+   |
+LL |     if (let Some(a) = opt) && (let Some(b) = a) {
+   |                                ^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:434:32
+   |
+LL |     if (let Some(a) = opt) && (let Some(b) = a) {
+   |                                ^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:443:9
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
+   |         ^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:443:9
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:443:31
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
+   |                               ^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:443:31
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
+   |                               ^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:449:9
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
+   |         ^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:449:9
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:449:31
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
+   |                               ^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:449:31
+   |
+LL |     if (let Some(a) = opt && (let Some(b) = a)) && true {
+   |                               ^^^^^^^^^^^^^^^
+
+error: `let` expressions are not supported here
+  --> $DIR/disallowed-positions.rs:455:9
+   |
+LL |     if (let Some(a) = opt && (true)) && true {
+   |         ^^^^^^^^^^^^^^^^^
+   |
+   = note: only supported directly in conditions of `if` and `while` expressions
+note: `let`s wrapped in parentheses are not supported in a context with let chains
+  --> $DIR/disallowed-positions.rs:455:9
+   |
+LL |     if (let Some(a) = opt && (true)) && true {
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:110:8
+   |
+LL |     if &let 0 = 0 {}
+   |        ^^^^^^^^^^ expected `bool`, found `&bool`
+   |
+help: consider removing the borrow
+   |
+LL -     if &let 0 = 0 {}
+LL +     if let 0 = 0 {}
+   |
+
+error[E0614]: type `bool` cannot be dereferenced
+  --> $DIR/disallowed-positions.rs:118:8
+   |
+LL |     if *let 0 = 0 {}
+   |        ^^^^^^^^^^
+
+error[E0600]: cannot apply unary operator `-` to type `bool`
+  --> $DIR/disallowed-positions.rs:122:8
+   |
+LL |     if -let 0 = 0 {}
+   |        ^^^^^^^^^^ cannot apply unary operator `-`
+
+error[E0277]: the `?` operator can only be applied to values that implement `Try`
+  --> $DIR/disallowed-positions.rs:132:8
+   |
+LL |     if (let 0 = 0)? {}
+   |        ^^^^^^^^^^^^ the `?` operator cannot be applied to type `bool`
+   |
+   = help: the trait `Try` is not implemented for `bool`
+
+error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
+  --> $DIR/disallowed-positions.rs:132:19
+   |
+LL | fn nested_within_if_expr() {
+   | -------------------------- this function should return `Result` or `Option` to accept `?`
+...
+LL |     if (let 0 = 0)? {}
+   |                   ^ cannot use the `?` operator in a function that returns `()`
+   |
+   = help: the trait `FromResidual<_>` is not implemented for `()`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:152:8
+   |
+LL |     if x = let 0 = 0 {}
+   |        ^^^^^^^^^^^^^ expected `bool`, found `()`
+   |
+help: you might have meant to compare for equality
+   |
+LL |     if x == let 0 = 0 {}
+   |           +
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:157:8
+   |
+LL |     if true..(let 0 = 0) {}
+   |        ^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:161:8
+   |
+LL |     if ..(let 0 = 0) {}
+   |        ^^^^^^^^^^^^^ expected `bool`, found struct `RangeTo`
+   |
+   = note: expected type `bool`
+            found struct `RangeTo<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:165:8
+   |
+LL |     if (let 0 = 0).. {}
+   |        ^^^^^^^^^^^^^ expected `bool`, found struct `RangeFrom`
+   |
+   = note: expected type `bool`
+            found struct `RangeFrom<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:171:12
+   |
+LL |     if let Range { start: _, end: _ } = true..true && false {}
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
+   |            |
+   |            expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:171:8
+   |
+LL |     if let Range { start: _, end: _ } = true..true && false {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:175:12
+   |
+LL |     if let Range { start: _, end: _ } = true..true || false {}
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
+   |            |
+   |            expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:175:8
+   |
+LL |     if let Range { start: _, end: _ } = true..true || false {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:182:12
+   |
+LL |     if let Range { start: F, end } = F..|| true {}
+   |            ^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `fn() -> bool`
+   |            |
+   |            expected fn pointer, found struct `Range`
+   |
+   = note: expected fn pointer `fn() -> bool`
+                  found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:182:41
+   |
+LL |     if let Range { start: F, end } = F..|| true {}
+   |                                         ^^^^^^^ expected `bool`, found closure
+   |
+   = note: expected type `bool`
+           found closure `[closure@$DIR/disallowed-positions.rs:182:41: 182:43]`
+help: use parentheses to call this closure
+   |
+LL |     if let Range { start: F, end } = F..(|| true)() {}
+   |                                         +       +++
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:182:8
+   |
+LL |     if let Range { start: F, end } = F..|| true {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:190:12
+   |
+LL |     if let Range { start: true, end } = t..&&false {}
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `&&bool`
+   |            |
+   |            expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:190:44
+   |
+LL |     if let Range { start: true, end } = t..&&false {}
+   |                                            ^^^^^^^ expected `bool`, found `&&bool`
+   |
+help: consider removing the `&&`
+   |
+LL -     if let Range { start: true, end } = t..&&false {}
+LL +     if let Range { start: true, end } = t..false {}
+   |
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:190:8
+   |
+LL |     if let Range { start: true, end } = t..&&false {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0277]: the `?` operator can only be applied to values that implement `Try`
+  --> $DIR/disallowed-positions.rs:128:20
+   |
+LL |         if let 0 = 0? {}
+   |                    ^^ the `?` operator cannot be applied to type `{integer}`
+   |
+   = help: the trait `Try` is not implemented for `{integer}`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:202:11
+   |
+LL |     while &let 0 = 0 {}
+   |           ^^^^^^^^^^ expected `bool`, found `&bool`
+   |
+help: consider removing the borrow
+   |
+LL -     while &let 0 = 0 {}
+LL +     while let 0 = 0 {}
+   |
+
+error[E0614]: type `bool` cannot be dereferenced
+  --> $DIR/disallowed-positions.rs:210:11
+   |
+LL |     while *let 0 = 0 {}
+   |           ^^^^^^^^^^
+
+error[E0600]: cannot apply unary operator `-` to type `bool`
+  --> $DIR/disallowed-positions.rs:214:11
+   |
+LL |     while -let 0 = 0 {}
+   |           ^^^^^^^^^^ cannot apply unary operator `-`
+
+error[E0277]: the `?` operator can only be applied to values that implement `Try`
+  --> $DIR/disallowed-positions.rs:224:11
+   |
+LL |     while (let 0 = 0)? {}
+   |           ^^^^^^^^^^^^ the `?` operator cannot be applied to type `bool`
+   |
+   = help: the trait `Try` is not implemented for `bool`
+
+error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
+  --> $DIR/disallowed-positions.rs:224:22
+   |
+LL | fn nested_within_while_expr() {
+   | ----------------------------- this function should return `Result` or `Option` to accept `?`
+...
+LL |     while (let 0 = 0)? {}
+   |                      ^ cannot use the `?` operator in a function that returns `()`
+   |
+   = help: the trait `FromResidual<_>` is not implemented for `()`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:244:11
+   |
+LL |     while x = let 0 = 0 {}
+   |           ^^^^^^^^^^^^^ expected `bool`, found `()`
+   |
+help: you might have meant to compare for equality
+   |
+LL |     while x == let 0 = 0 {}
+   |              +
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:249:11
+   |
+LL |     while true..(let 0 = 0) {}
+   |           ^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:253:11
+   |
+LL |     while ..(let 0 = 0) {}
+   |           ^^^^^^^^^^^^^ expected `bool`, found struct `RangeTo`
+   |
+   = note: expected type `bool`
+            found struct `RangeTo<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:257:11
+   |
+LL |     while (let 0 = 0).. {}
+   |           ^^^^^^^^^^^^^ expected `bool`, found struct `RangeFrom`
+   |
+   = note: expected type `bool`
+            found struct `RangeFrom<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:263:15
+   |
+LL |     while let Range { start: _, end: _ } = true..true && false {}
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
+   |               |
+   |               expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:263:11
+   |
+LL |     while let Range { start: _, end: _ } = true..true && false {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:267:15
+   |
+LL |     while let Range { start: _, end: _ } = true..true || false {}
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
+   |               |
+   |               expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:267:11
+   |
+LL |     while let Range { start: _, end: _ } = true..true || false {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:274:15
+   |
+LL |     while let Range { start: F, end } = F..|| true {}
+   |               ^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `fn() -> bool`
+   |               |
+   |               expected fn pointer, found struct `Range`
+   |
+   = note: expected fn pointer `fn() -> bool`
+                  found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:274:44
+   |
+LL |     while let Range { start: F, end } = F..|| true {}
+   |                                            ^^^^^^^ expected `bool`, found closure
+   |
+   = note: expected type `bool`
+           found closure `[closure@$DIR/disallowed-positions.rs:274:44: 274:46]`
+help: use parentheses to call this closure
+   |
+LL |     while let Range { start: F, end } = F..(|| true)() {}
+   |                                            +       +++
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:274:11
+   |
+LL |     while let Range { start: F, end } = F..|| true {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:282:15
+   |
+LL |     while let Range { start: true, end } = t..&&false {}
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^   - this expression has type `&&bool`
+   |               |
+   |               expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:282:47
+   |
+LL |     while let Range { start: true, end } = t..&&false {}
+   |                                               ^^^^^^^ expected `bool`, found `&&bool`
+   |
+help: consider removing the `&&`
+   |
+LL -     while let Range { start: true, end } = t..&&false {}
+LL +     while let Range { start: true, end } = t..false {}
+   |
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:282:11
+   |
+LL |     while let Range { start: true, end } = t..&&false {}
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<bool>`
+
+error[E0277]: the `?` operator can only be applied to values that implement `Try`
+  --> $DIR/disallowed-positions.rs:220:23
+   |
+LL |         while let 0 = 0? {}
+   |                       ^^ the `?` operator cannot be applied to type `{integer}`
+   |
+   = help: the trait `Try` is not implemented for `{integer}`
+
+error[E0614]: type `bool` cannot be dereferenced
+  --> $DIR/disallowed-positions.rs:311:5
+   |
+LL |     *let 0 = 0;
+   |     ^^^^^^^^^^
+
+error[E0600]: cannot apply unary operator `-` to type `bool`
+  --> $DIR/disallowed-positions.rs:315:5
+   |
+LL |     -let 0 = 0;
+   |     ^^^^^^^^^^ cannot apply unary operator `-`
+
+error[E0277]: the `?` operator can only be applied to values that implement `Try`
+  --> $DIR/disallowed-positions.rs:325:5
+   |
+LL |     (let 0 = 0)?;
+   |     ^^^^^^^^^^^^ the `?` operator cannot be applied to type `bool`
+   |
+   = help: the trait `Try` is not implemented for `bool`
+
+error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
+  --> $DIR/disallowed-positions.rs:325:16
+   |
+LL | fn outside_if_and_while_expr() {
+   | ------------------------------ this function should return `Result` or `Option` to accept `?`
+...
+LL |     (let 0 = 0)?;
+   |                ^ cannot use the `?` operator in a function that returns `()`
+   |
+   = help: the trait `FromResidual<_>` is not implemented for `()`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:356:10
+   |
+LL |     (let Range { start: _, end: _ } = true..true || false);
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^   ---- this expression has type `bool`
+   |          |
+   |          expected `bool`, found struct `Range`
+   |
+   = note: expected type `bool`
+            found struct `std::ops::Range<_>`
+
+error[E0308]: mismatched types
+  --> $DIR/disallowed-positions.rs:379:5
+   |
+LL | fn outside_if_and_while_expr() {
+   |                                - help: try adding a return type: `-> &bool`
+...
+LL |     &let 0 = 0
+   |     ^^^^^^^^^^ expected `()`, found `&bool`
+
+error[E0277]: the `?` operator can only be applied to values that implement `Try`
+  --> $DIR/disallowed-positions.rs:321:17
+   |
+LL |         let 0 = 0?;
+   |                 ^^ the `?` operator cannot be applied to type `{integer}`
+   |
+   = help: the trait `Try` is not implemented for `{integer}`
+
+error: aborting due to 215 previous errors
+
+Some errors have detailed explanations: E0277, E0308, E0600, E0614.
+For more information about an error, try `rustc --explain E0277`.